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550 Requested action not taken: mailbox unavailable (e.g., mailbox not found, no access, or command rejected for policy reasons) 551 User not local; please try <forward-path> 552 Requested mail action aborted: exceeded storage allocation
Although the SMTP is a mature technology, counting more than thirty years, its architecture is increasingly strained by both normal and unsolicited load. [2] The email systems have been enhanced with reputation systems tied to the actual sender of the email, with the idea of recipient's email servers rejecting the email when a forged sender is used in the protocol.
Microsoft Exchange Server (as of Exchange Server 2000) Novell GroupWise; OpenSMTPD; Oracle Communications Messaging Server; Postfix; Sendmail (since 6.57) The following servers can be configured to advertise 8BITMIME, but do not perform conversion of 8-bit data to 7-bit when connecting to non-8BITMIME relays: